BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Margaret Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 109 species recorded across 48 survey years, still active.

109Species RecordedSpecies recordedDistinct species detected on standard-protocol BBS runs here across all years on record — a measure of survey breadth, not a complete checklist.Full methodology →
48Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1969–2024Span
3Observers

Bird Species Found on Pennsylvania Margaret

Top 40 of 109 species by most recent count. Each links to its species trend.

Species recorded on the Margaret route.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →Baseline yearThe first year of the smoothed window the trend is measured from. An earlier baseline means a longer record stands behind the number.Full methodology →History
American RobinTurdidae662024-27%1972
Red-eyed VireoVireonidae642024+453%1972
Red-winged BlackbirdIcteridae582024-28%1972
Song SparrowPasserellidae422024+9%1972
Common GrackleIcteridae332024+57%1972
European StarlingSturnidae312024-1%1972
Eastern TowheePasserellidae272024+27%1972
Gray CatbirdMimidae252024-4%1972
Mourning DoveColumbidae222024+408%1972
American CrowCorvidae222024+30%1972
House SparrowPasseridae202024-15%1972
Common YellowthroatParulidae192024+48%1972
American GoldfinchFringillidae152024-33%1972
Black-capped ChickadeeParidae122024+175%1978
Red-bellied WoodpeckerPicidae122024+967%1992
Indigo BuntingCardinalidae112024+117%1972
Tufted TitmouseParidae112024+150%1972
Turkey VultureCathartidae112024+263%2001
OvenbirdParulidae102024+720%1973
Wood ThrushTurdidae102024-38%1972
Yellow-throated VireoVireonidae102024+100%1991
Northern CardinalCardinalidae92024+24%1972
Carolina WrenTroglodytidae92024+188%1974
Baltimore OrioleIcteridae82024+40%1972
Yellow WarblerParulidae82024+13%1972
Blue-headed VireoVireonidae82005+700%1992
Chipping SparrowPasserellidae72024-62%1972
Cedar WaxwingBombycillidae72024+500%1981
KilldeerCharadriidae62024+17%1972
Brown-headed CowbirdIcteridae62024-65%1972
Orchard OrioleIcteridae62024+367%1997
Rock PigeonColumbidae52023+70%1978
Field SparrowPasserellidae52024-65%1972
Scarlet TanagerCardinalidae52024-15%1972
Barn SwallowHirundinidae42024-22%1972
Acadian FlycatcherTyrannidae42024+225%1974
White-breasted NuthatchSittidae42023+40%1974
Hooded WarblerParulidae42024+267%1982
Northern MockingbirdMimidae42024+183%2002
Chimney SwiftApodidae32024-22%1972

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.